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Adrian Chadd is an Australian software engineer and systems architect. He is a committer for the FreeBSD operating system and has worked on networking, wireless drivers, and web caching infrastructure.^[1]

Chadd worked as a systems engineer at AARNet. He was a maintainer of the Squid Web Cache project for 15 years, managing the 2.7 stable branch. His work focused on the Cyclic Object Storage System (COSS).^[2]

While employed at Qualcomm Atheros, Chadd rewrote driver components for the ath9k (Linux) and ath (FreeBSD) drivers, moving them from proprietary binary blobs to open-source code. This development was cited during the Free Software Foundation's "Respects Your Freedom" (RYF) certification for a wireless adapter in 2013.^[3]

From 2013 to 2016, Chadd worked on the Netflix Open Connect Content Delivery Network. He implemented kernel optimizations, including Receive Side Scaling (RSS) and NUMA-aware networking, to improve throughput on single-socket servers.^[4]

In 2018, Chadd joined Meta Platforms to work on hardware for augmented reality, specifically the Orion compute unit. His work included PCIe power management and USB transport debugging.^[5]

Security: In 2014, Chadd authored a patch for a 30-year-old vulnerability in the FreeBSD TCP stack involving predictable sequence numbers, known as the "Demon bug."Chirgwin, Richard (2014-12-11). "FreeBSD developers VANQUISH Demon bug". The Register. Retrieved 2026-04-28.

Patents: Chadd is listed as an inventor on several patents regarding wireless signal processing and network architecture:

• Radar Detection: US Patent 9304189B2 - Systems and methods for detecting radar signals (Qualcomm Inc)."US9304189B2 - Systems and methods for detecting radar signals". Google Patents. Retrieved 2026-04-28.
• Wireless Channelization: EP 3539335B1 - Wireless channelization (Qualcomm Inc)."EP3539335B1 - Wireless channelization". Google Patents. Retrieved 2026-04-28.
• Network Stack: US 20210184991A1 - Systems and Methods for Network Stack (Meta)."US20210184991A1 - Systems and Methods for Network Stack". Google Patents. Retrieved 2026-04-28.
• Wireless Audio: HK 40015115B - Wireless coordination device for audio playback (B&W Group Ltd)."HK40015115B - Wireless coordination device for audio playback". Google Patents. Retrieved 2026-04-28.

• Adrian Chadd on GitHub